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Add Function::Call Napi::Value override #1026

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merged 2 commits into from
Feb 21, 2022

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rgerd
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@rgerd rgerd commented Jul 23, 2021

Adds an override to Napi::Function::Call so that you can call it with a c-style array of Napi::Value's

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Note from discussion in Node-api team meeting today, we should validate this does not add any performance overhead to the existing cases.

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rgerd commented Aug 2, 2021

Note from discussion in Node-api team meeting today, we should validate this does not add any performance overhead to the existing cases.

@mhdawson Is there something I should do on my end to validate performance?

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mhdawson commented Aug 3, 2021

@rgerd not at this point it was more of a reminder to reviewers of the PR

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mhdawson commented Sep 3, 2021

@gabrielschulhof wondering if you have more review questions/comments?

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mhdawson commented Sep 10, 2021

@rgerd thanks for your patience, discussed again in the Node-API team meeting today. We agreed this can land once rebased to address the conflicts.

One additional suggestion was that it would make sense to add another overload to accept a std:vector of Value objects either in this or a follow on PR.

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LGTM

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Commented with a question about compatibility issue #1026 (comment). We may need to come to a conclusion about the usage pattern compatibility until we can proceed.

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gabrielschulhof commented Nov 19, 2021

@rgerd in today's Node-API team meeting @vmoroz brought up a good point, namely that it may not be a good idea to have an override passing a C-style array of napi_value items because having a well-formed array description is a safer choice. For example, C++20 will have std::span<T>.

He proposed that we create a simple, say, Napi::ValueSpan class which will be constructed with napi_value and size_t and create an override that accepts such an instance.

my_function.Call(Napi::ValueSpan(count, values));

We can use C++ templating to create a constructor override that can deduce the length of the array without having to pass it in explicitly as a parameter. We should structure the class definition to match that of std::span<T> exactly, so that, once we start using C++20, we can simply convert the definition to an alias of std::span<T>.

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We discussed again in today's Node-API team meeting. The conclusion we came to was that it would be better for signature of the new method to use std::vector. For example:

Value Call(napi_value recv, const std::vector<Value>& args) ;

It is possible to get a Value* array into a std::vector in a few ways (assign, constructor etc.)

@rgerd is this something you'd still like to move forward?

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rgerd commented Jan 25, 2022

Hi, thank you very much for the feedback. Yes, I'd still like to move it forward, sorry for disappearing. I should be able to make the changes and validate within the next week or so.

@rgerd rgerd force-pushed the function-call-cpp-value branch from e69fb2c to edd0cb4 Compare February 11, 2022 23:35
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rgerd commented Feb 11, 2022

Rebased with the suggested changes. The style checks are failing on function.js for parts of the file unrelated to my changes, but I also noticed eslint was added after function.js was last touched, so it seems like it hasn't been linted by the CI until now.

I could fix the linting problems myself, but just wanted to check if you have any opinions on introducing a bunch of unrelated diffs in this PR, or if we should open another PR to go in first to address those style changes.

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@rgerd its a good question about the linter changes. I think in this case what might makes sense is to have 2 commits in the PR, one for the linter changes and one for the change your are making. When we land we can keep both commits instead of squashing. That seems better than using 2 PR to accomplish the same thing.

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@NickNaso will take a look/test on ci and then will go ahead and land.

@NickNaso NickNaso merged commit c54aeef into nodejs:main Feb 21, 2022
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5 participants